Water-cooled furnace door



E. W. POTTM EY ER WATER-COOLED FURNACE DOOR April 3, 1951 2 Sheets-Sheet 1 Filed Aug. 28, 1945 WN mum 2 Sheets-Sheet 2 E. W. POTTMEYER WATER-COOLED FURNACE DOOR April 3, 1951 Filed Aug. 28, 1945 Patented Apr. 3, 1951 UNITED STATES PATENT OFFICE Edward W.. Pottineyer, Pittsbur h, Pa, assi nor to- Blaw-Knox Company, Pittsburgh,- Pa., a; corporation of New Jersey Application August 28, 1945', Serial No. 613,073

This invention relates to water-cooled furnace doors and, in particular, to a door comprising a hollow panel and a hollow peri heral flange" errtending inwardly therefrom forming a space for a refractory lining, the anel'- being formed by a plurality of spaced passages or ducts of gen-- erally rectangular shape in section. I 7

Furnace doors of the general type designated above have been known heretofore but these doors as previously constructed have been costly and the construction used has not lentitself to the fabrication of the doors coverin the wide range of sizes demanded by the trade from a reasonably small number or standard parts. The object of invention is to provide a door structure which can be fabricated at relatively low cost and is particularly adapted to the fabrication. of doors in a wide range of sizes from a few parts which may be carried in stools with out difficulty.

In a preferred embodiment and practice of the invention, I. employ a plate of a suitable size to form the inner wall of the door panel. The marginal portions of the plate are shaped to form the inner sides and the face of the flange.- Ver'tically' extending channels are welded to the outer surface or the plate with the flanges abut= ting the latter.- V'erticall'y extending angles have one of their flanges welded to the side edges or"- the face or the door flange and the other to the panel. Top and bottom closures are welded to the ends of the channels and to upper and lower edges of the face of the door flange.

The finished door isthus adapted for the oil'cu lation of cooling water through all portionsv thereof to prevent overheating.

For a complete understanding. of the: invention, reference is made to the accompanying drawings illustratingthe preferred embodiment and the following" detailed description thereof.

In the drawings,-

' Figure 1' is an elevation of one form of door embodying the invention;

Figure 2' is a View partly in plan and partly in 4 Claims. (01. 122-498) Figure 6 is a partial front elevation showing a portion of Figure 1 to enlarged scale-f Figures- 7, 8 and 9 areviews corresponding to Figures 4, 5 and 6 showing a slightly Modified 5 construction, and

Figure 10 is a view similar to Figures 5 and 8'- showing a further modification.

Referring now in detail to the drawings, the door of my invention comprises generally a hol low panel l0 and a hollow peripheral flange ll extending inwardly therefrom. The panel in-- cludes a plurality of spacedwater passages H. The flange ll defines a space for a refractory lining (not shown), which is applied to the door before it is placed in service Referring now more particularly to Figures 4 through 6-, a plate 13 has its marginal portions shaped to form the inner sides [4- of the flange H and the face l5 of the latter. The shaping of the plate is is preferably effected by either hot or cold pressing between suitable dies. The body of the plate, i. e., theportion defined by the inner edges of thesides H of the flange, forms the inner wall of the panel [0.

The water passages 12 whichconstitutethe panel of the door are defined by channelsf6 ex tending vertically of the door having the edges of their flanges welded to the outer surface of the plate [3 as at H. The channels [6' are spaced apart by a small fraction of their width, leaving a space 18 therebetween. I

Angles [9 extending vertically are positioned at thesides of the door. Each angle has the" edge of one of its flanges welded to one of the side edges of the face E5 of the flange H, as at 20. The other flange of the angle is welded to the panel m, specifically in the embodiment illustrated, to' the junction between the outer flange and web of the channel I6 nearest the side of the door as at 2|.

The angles l9 extend the full height of the door. The channels l6 may extend the full I height of the door or terminate a short distance below the top and above the bottom thereof,-

3 l8 to prevent the accumulation of flying particles.

It will be apparent that the construction described so far provides a door having a hollow panel and a hollow periphera1 flange, both the panel and flange being fully closed except for the spaces between adjacent channels l6 and between the inner horizontal sides 13a of the flange and the top and bottom closures 22 and 23. These rectangular spaces are closed by welding in filler plates of appropriate size and shape shown at 25.

It will be understood that the horizontal edges of these filler plates are welded to the top and bottom closures and to the inner sides of the flange II while their vertical sides are welded to the edges of the flanges of the channels IS. The hollow flange l l is uninterrupted around the entire periphery of the door. The passages I2 formed by the channels I6, furthermore, are in communication with the flange at the top and bottom of the door.

Referring again briefly to Figures 1 through 3,

the door is completed except for the refractory lining by welding thereto lugs 23 for counterbalance cables and a lifting yoke 21. Inlet and outlet nipples 28 and 29 are welded to the door in line with holes opening into the interior. A vent nipple 30 is also welded on. Wash-out plugs 3! are threaded into tapped holes in blocks 32 welded in cut-outs at the lower ends of the angles I Holes 33 are formed in the plate is in line with the spaces l8 between adjacent channels it to permit observation of the refractory lining so that erosion thereof beyond the danger point may readily be detected.

I An observation port is provided by rings 34 and 35. The ring 33 is set in a hole in the central channel [6 and welded thereto and to the plate I3 which also has a hole adapted to receive the ring. The ring 35 is welded to the plate [3 coaXially with the ring 34. A cover 36 normally overlies the observation port. In some cases the ring 35 is unnecessary. If the door is brick lined, the observation port may be merel an opening in the brick.

) Figures 7 through 9 illustrate a construction generally similar to that described above but differing slightly therefrom in detail. The modified construction utiiizes rolled channels 13a to form the water passages l2 instead of the channels l6 formed from fiat plate by bending up their edges. The angles l9a at the sides of the door are also rolled sections instead of being bent from flat plate as in the case of the angles 9. The channels 53a, furthermore, have a length substantially equal to the height of the body portion of the plate 53 and terminate short of the upper and lower edges of the face 15 of the flange H. Angles 37 and 38 form the top and bottom closures of the door. These angles may conveniently be formed from flat plate by bending and each has the edge of one flange welded to the edge of the top or bottom edge of the face I as at 39. The other flange is welded to the upper and lower ends of the webs of the channels Eta as at 46.

This construction leaves open spaces between the channels lta adjacent the upper and lower ends thereof and these spaces are closed by filler plates 4| welded in place as clearly shown in the drawings. In other respects, the construction of the door in Figures 7 through 9 is similar to that in Figures 1 through 6 and the two structures are the full equivalent of each other for all practical purposes.

A further modified form of construction shown in Figure 10 has certain peculiar advantages. This modification is generally similar to those already described but has a top closure 22a of fiat plate as in the form of the invention shown in Figures 1 through 6 and a bottom closure formed from an angle 380. as in themodiflcation of Figures 7 through 9. The angle 38a is preferably somewhat thicker than the plate [3 and the webs of the channels Hi. In this modification, the channels [6 extend to the top of the door as shown in Figures 3, 5 and 6 but terminate short of the bottom of the door, as shown in Figure 8. Filler blocks 25 and 4| are inserted in the top and bottom of the door, respectively, as in Figures 5 and 8.

The construction of Figure 10 has increased Strength and rigidity at the bottom whereby it is well adapted to withstand the severe abuse to which that portion of a door is subjected both by reason of impact against the sill, of the charging port on closing the door, contact with material in charging boxes when the door is raised, and exposure to the temperature of molten metal when pouring the latter from a ladle into the furnace through the port. At the same time, the relatively simple construction atthe top is retained, utilizing a flat plate as the closure.

It will be apparent from the foregoing that my invention provides a door construction and a method for fabricating it having important advantages over the structures and practice known heretofore. In the first place, the cost of a door constructed in accordance with my invention is less than the cost of doors of the same general type as previously constructed. The door of my invention, at the same time, has all the advantages of previous doors from the standpoint of rigidity and freedom of circulation of cooling water. The rigidity of the door is such that stays or braces are not required.

A further advantage of the invention is that it permits the fabrication of doors in a wide variety of sizes from a relatively small number of stock parts, i. e., the plate I3, channels [6 or 16a and angles ill or l9a; The fitting together and joining of the various parts is relatively simple and easy. The amount of welding required is not excessive and the construction requires no elaborate preparation for welding since there are few joints where chipping or bevelin of the meeting edges is necessary.

The spaces l8 between the channels it make it possible to observe the condition of the refractory lining through holes 33 which are much simpler and cheaper to form than the pipe nip-'- ples used heretofore which were welded to the spaced walls of the panel.

Although I have illustrated and described herein but two preferred forms of the invention, it will be recognized that changes in the constructions illustrated and the fabricating practice described may be made without departing from the spirit of the invention or the scope of the appended claims.

I claim:

1. In a water-cooled furnace door for openhearth furnaces or the like, said door having a hollow panel and a hollow peripheral flange extending inwardly therefrom, in combination, a plate forming a continuous flat inner wall of said panel and having its marginal portions extending inwardly to form the inner sides of said flange, the edges of said portions being substantially parallel to the central portion of the plate and forming the face of said flange, vertical channels having their flanges faced inwardly and welded to the outer surface of said plate,

hollow panel and a hollow peripheral flange eX- tending inwardly therefrom, in combination, a plate forming a substantially continuous flat inner wall for said door and the inner sides and face of said flange, said inner sides and inner wall defining a refractory recess in said door, vertical channel sections of regular shape having their flanges faced inwardly and welded to the outer surface of said inner Wall, said channel sections being horizontally spaced and extending A at least to said inner sides across the top and bottom of said door, vertical angle sectionsat the sides of said door, each having one flange welded to a side edge of said face and its other flange welded to the outside of said furnace door, closures respectively welded to the bottom and top edges of said face and to the upper and lower ends of said channel sections, at least one of said closures being a horizontal angle section, and filler plates welded to the outer surface of said inner wall and adjacent flanges of said channel sections to make said door water-tight.

3. In a water-cooled panel furnace door for open-hearth furnaces or the like, said door having a hollow peripheral flange extending inwardly therefrom, in combination, a shaped plate forming the inner wall of said door and at least the inner sides of said flange, said inner wall being straight in a generally vertical direction and defining with said innersides a recess in said door for a lining refractory, vertical bent forms having one edge welded to the respective vertical outer edges of said peripheral flange to form the outer vertical sides and rear vertical corners of said furnace door and the other edge of said respective bent forms extending to the back of said door and welded thereto, vertical channels having their flanges faced toward and welded to the outer surface of said inner wall, said channels being horizontally spaced and extending generally between the bottom and top of said door,

horizontal closures having the edge of a horizontal flange of each welded respectively to the top and bottom edges of said peripheral flange to form the outer top and bottom sides respectively of said furnace door, said closures extendin and welded to the respective top and bottom edges of the webs of said channels, at least the bottom 6 7 one of said closures being an angle forming the bottom outer edge of said furnace door, and filler members closing the space between the sides of adjacent channels, the outer surface of said inner wall and said angle to close the hollow interior of said furnace door.

4. In a water-cooled panel furnace door for open-hearth furnaces or the like, said door having a hollow peripheral flange extending inwardly therefrom, in combination, a shaped plate forming the inner wall of said door and the inner sides and face of said peripheral flange, said inner wall being straight in a generally vertical direction anddefining with said inner sides a recess in said door for a lining refractory, vertical angles having the edge of one flange welded to the respective vertical outer edges of the face of said peripheral flange to form the outer vertical sides and rear vertical corners of said furnace door, the edge of the other flange of said respective vertical angles welded to the outside of said furnace door, vertical channels having their flanges faced inwardly and welded to the outer surface of said inner wall, said channels being horizontally spaced and extending generally between the top and bottom of said door, the laterally outermost channels being welded to the edge of said other flange of said vertical angles respectively, the outer surface of the webs of said channels defining the back of said furnace door, horizontal angles having the edge of a horizontal flange of each welded respectively to the top and bottom edges of the face of said peripheral flange to form the outer top and bottom sides and the respective vertical outer horizontal corners of said furnace door, the other flanges of said horizontal angles facing each other across the back of said furnace door and extending and welded to the top and bottom edges respectively of the webs of said channels, and filler members closing the space between the flanges of adjacent channels, the outer surface of said inner wall and said angles to close the hollow interior of said furnace door.

EDVJARD W. POT'IMEYER.

CE'IED The followingreferences are of record in the file of this pate UNITED STATES PATENTS 

